Halogenated Propene Purification via Solid Adsorbent Bed
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Solution Overview
Problem
Halogenated propenes, such as 1,3,3-tetrafluoropropene and 1-chloro-3,3-trifluoropropene, react with sulfuric acid, generating corrosive acidic impurities that can damage downstream processing equipment, necessitating a cost-effective method for removing these impurities from halogenated propene streams.
Innovation Solution
Passing the halogenated propene stream through a solid adsorbent bed containing an acid reactive agent, like activated alumina, and a water absorbing agent, such as molecular sieves, to effectively remove acidic impurities like hydrogen fluoride, hydrogen chloride, and sulfuric acid, with the acid reactive agent at the top section and water absorbing agent at the bottom section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If concentrated sulfuric acid is used as a drying agent to remove water from halogenated propene streams, then water removal efficiency is improved, but corrosive acidic impurities are generated that damage downstream processing equipment
Solution Approach 1:
The patent extracts and removes the harmful acidic impurities (HF, HCl, H2SO4) generated during the drying process by passing the halogenated propene stream through a solid adsorbent bed containing basic materials such as activated alumina, calcium oxide, or magnesium oxide. This separates the harmful substances from the product stream, maintaining both water removal efficiency and equipment safety.
Solution Approach 2:
The patent introduces a solid adsorbent bed as an intermediary between the drying process and downstream equipment. This intermediary captures acidic impurities through chemical adsorption reactions, preventing them from reaching and corroding downstream processing equipment while allowing the dried halogenated propene to pass through.
2Object-affected harmful factors
If a solid adsorbent bed with acid reactive agent is used to remove acidic impurities, then corrosion protection is improved, but device complexity increases due to additional processing steps
Solution Approach 1:
The patent combines multiple functions into a single integrated drying and purification system. The solid adsorbent bed simultaneously performs water removal and acidic impurity removal through its dual capacity for hydration and acid neutralization, eliminating the need for separate processing units and reducing overall system complexity.
Solution Approach 2:
The solid adsorbent materials used in the patent possess multiple functions: they act as drying agents to remove water, as acid-reactive agents to neutralize HF, HCl, and H2SO4, and as filtration media. This multi-functionality allows a single device to handle both water removal and corrosion protection, simplifying the processing system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces the concentration of acidic impurities to below 0.5 ppm, minimizing corrosion risks and maintaining the integrity of processing equipment while ensuring a cost-effective solution.
Implementation Method 1
certain halogenated propenes are reactive with sulfuric acid, generating small amounts of acids, non-exclusively including HF and HCl
Implementation Method 2
Passing the halogenated propene stream through a solid adsorbent bed containing an acid reactive agent
Implementation Method 3
water absorbing agent, such as molecular sieves
Data Source
AI summary
This invention pertains to a method for removing acidic impurity from halogenated olefins, especially methods for removing acidic impurity from halogenated propenes, and even more particularly to methods for removing acidic impurity from 1,3,3,3-tetrafluoro-1-propene (HFO-1234ze), 2,3,3,3-tetrafluoro-1-propene (HFO-1234yf), 1-chloro-3,3,3-trifluoro-1-propene (HCFO-1233zd), and 2-chloro-3,3,3-trifluoro-1-propene (HCFO-1233xf). The method is conducted by passing the halogenated olefin stream, in liquid or gas form, through a solid adsorbent bed, which contains at least one acid reactive agent.